I have a 3 inch Pro Comp lift, Dana 30 front and Dana 44 rear on my '98 Cherokee 4 door... Right now I have 30" all terrains on it. Planning to put 31x91/2x15s. Was wondering if I could put like 2 inches of "spring cups and blocks" type of lift in conjunction with my current lift and run like 10 1/2" wide tires in the rear?????

 

Unless you want that extra lift anyway, try running the tires with the original lift first and see if you have to add a budget boost and lengthen shocks and bumpstops to stop from rubbing from there